arch/m68k/kernel/setup_mm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/m68k/kernel/setup.c
   4  *
   5  *  Copyright (C) 1995  Hamish Macdonald
   6  */
   7
   8 /*
   9  * This file handles the architecture-dependent parts of system setup
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/mm.h>
  14 #include <linux/sched.h>
  15 #include <linux/delay.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/fs.h>
  18 #include <linux/console.h>
  19 #include <linux/genhd.h>
  20 #include <linux/errno.h>
  21 #include <linux/string.h>
  22 #include <linux/init.h>
  23 #include <linux/memblock.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/module.h>
  27 #include <linux/nvram.h>
  28 #include <linux/initrd.h>
  29
  30 #include <asm/bootinfo.h>
  31 #include <asm/byteorder.h>
  32 #include <asm/sections.h>
  33 #include <asm/setup.h>
  34 #include <asm/fpu.h>
  35 #include <asm/irq.h>
  36 #include <asm/io.h>
  37 #include <asm/machdep.h>
  38 #ifdef CONFIG_AMIGA
  39 #include <asm/amigahw.h>
  40 #endif
  41 #include <asm/atarihw.h>
  42 #ifdef CONFIG_ATARI
  43 #include <asm/atari_stram.h>
  44 #endif
  45 #ifdef CONFIG_SUN3X
  46 #include <asm/dvma.h>
  47 #endif
  48 #include <asm/macintosh.h>
  49 #include <asm/natfeat.h>
  50
  51 #if !FPSTATESIZE || !NR_IRQS
  52 #warning No CPU/platform type selected, your kernel will not work!
  53 #warning Are you building an allnoconfig kernel?
  54 #endif
  55
  56 unsigned long m68k_machtype;
  57 EXPORT_SYMBOL(m68k_machtype);
  58 unsigned long m68k_cputype;
  59 EXPORT_SYMBOL(m68k_cputype);
  60 unsigned long m68k_fputype;
  61 unsigned long m68k_mmutype;
  62 EXPORT_SYMBOL(m68k_mmutype);
  63 #ifdef CONFIG_VME
  64 unsigned long vme_brdtype;
  65 EXPORT_SYMBOL(vme_brdtype);
  66 #endif
  67
  68 int m68k_is040or060;
  69 EXPORT_SYMBOL(m68k_is040or060);
  70
  71 extern unsigned long availmem;
  72
  73 int m68k_num_memory;
  74 EXPORT_SYMBOL(m68k_num_memory);
  75 int m68k_realnum_memory;
  76 EXPORT_SYMBOL(m68k_realnum_memory);
  77 unsigned long m68k_memoffset;
  78 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
  79 EXPORT_SYMBOL(m68k_memory);
  80
  81 static struct m68k_mem_info m68k_ramdisk __initdata;
  82
  83 static char m68k_command_line[CL_SIZE] __initdata;
  84
  85 void (*mach_sched_init) (void) __initdata = NULL;
  86 /* machine dependent irq functions */
  87 void (*mach_init_IRQ) (void) __initdata = NULL;
  88 void (*mach_get_model) (char *model);
  89 void (*mach_get_hardware_list) (struct seq_file *m);
  90 /* machine dependent timer functions */
  91 int (*mach_hwclk) (int, struct rtc_time*);
  92 EXPORT_SYMBOL(mach_hwclk);
  93 unsigned int (*mach_get_ss)(void);
  94 int (*mach_get_rtc_pll)(struct rtc_pll_info *);
  95 int (*mach_set_rtc_pll)(struct rtc_pll_info *);
  96 EXPORT_SYMBOL(mach_get_ss);
  97 EXPORT_SYMBOL(mach_get_rtc_pll);
  98 EXPORT_SYMBOL(mach_set_rtc_pll);
  99 void (*mach_reset)( void );
 100 void (*mach_halt)( void );
 101 void (*mach_power_off)( void );
 102 #ifdef CONFIG_HEARTBEAT
 103 void (*mach_heartbeat) (int);
 104 EXPORT_SYMBOL(mach_heartbeat);
 105 #endif
 106 #ifdef CONFIG_M68K_L2_CACHE
 107 void (*mach_l2_flush) (int);
 108 #endif
 109 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 110 int isa_type;
 111 int isa_sex;
 112 EXPORT_SYMBOL(isa_type);
 113 EXPORT_SYMBOL(isa_sex);
 114 #endif
 115
 116 extern int amiga_parse_bootinfo(const struct bi_record *);
 117 extern int atari_parse_bootinfo(const struct bi_record *);
 118 extern int mac_parse_bootinfo(const struct bi_record *);
 119 extern int q40_parse_bootinfo(const struct bi_record *);
 120 extern int bvme6000_parse_bootinfo(const struct bi_record *);
 121 extern int mvme16x_parse_bootinfo(const struct bi_record *);
 122 extern int mvme147_parse_bootinfo(const struct bi_record *);
 123 extern int hp300_parse_bootinfo(const struct bi_record *);
 124 extern int apollo_parse_bootinfo(const struct bi_record *);
 125
 126 extern void config_amiga(void);
 127 extern void config_atari(void);
 128 extern void config_mac(void);
 129 extern void config_sun3(void);
 130 extern void config_apollo(void);
 131 extern void config_mvme147(void);
 132 extern void config_mvme16x(void);
 133 extern void config_bvme6000(void);
 134 extern void config_hp300(void);
 135 extern void config_q40(void);
 136 extern void config_sun3x(void);
 137
 138 #define MASK_256K 0xfffc0000
 139
 140 extern void paging_init(void);
 141
 142 static void __init m68k_parse_bootinfo(const struct bi_record *record)
 143 {
 144         uint16_t tag;
 145
 146         save_bootinfo(record);
 147
 148         while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
 149                 int unknown = 0;
 150                 const void *data = record->data;
 151                 uint16_t size = be16_to_cpu(record->size);
 152
 153                 switch (tag) {
 154                 case BI_MACHTYPE:
 155                 case BI_CPUTYPE:
 156                 case BI_FPUTYPE:
 157                 case BI_MMUTYPE:
 158                         /* Already set up by head.S */
 159                         break;
 160
 161                 case BI_MEMCHUNK:
 162                         if (m68k_num_memory < NUM_MEMINFO) {
 163                                 const struct mem_info *m = data;
 164                                 m68k_memory[m68k_num_memory].addr =
 165                                         be32_to_cpu(m->addr);
 166                                 m68k_memory[m68k_num_memory].size =
 167                                         be32_to_cpu(m->size);
 168                                 m68k_num_memory++;
 169                         } else
 170                                 pr_warn("%s: too many memory chunks\n",
 171                                         __func__);
 172                         break;
 173
 174                 case BI_RAMDISK:
 175                         {
 176                                 const struct mem_info *m = data;
 177                                 m68k_ramdisk.addr = be32_to_cpu(m->addr);
 178                                 m68k_ramdisk.size = be32_to_cpu(m->size);
 179                         }
 180                         break;
 181
 182                 case BI_COMMAND_LINE:
 183                         strlcpy(m68k_command_line, data,
 184                                 sizeof(m68k_command_line));
 185                         break;
 186
 187                 default:
 188                         if (MACH_IS_AMIGA)
 189                                 unknown = amiga_parse_bootinfo(record);
 190                         else if (MACH_IS_ATARI)
 191                                 unknown = atari_parse_bootinfo(record);
 192                         else if (MACH_IS_MAC)
 193                                 unknown = mac_parse_bootinfo(record);
 194                         else if (MACH_IS_Q40)
 195                                 unknown = q40_parse_bootinfo(record);
 196                         else if (MACH_IS_BVME6000)
 197                                 unknown = bvme6000_parse_bootinfo(record);
 198                         else if (MACH_IS_MVME16x)
 199                                 unknown = mvme16x_parse_bootinfo(record);
 200                         else if (MACH_IS_MVME147)
 201                                 unknown = mvme147_parse_bootinfo(record);
 202                         else if (MACH_IS_HP300)
 203                                 unknown = hp300_parse_bootinfo(record);
 204                         else if (MACH_IS_APOLLO)
 205                                 unknown = apollo_parse_bootinfo(record);
 206                         else
 207                                 unknown = 1;
 208                 }
 209                 if (unknown)
 210                         pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
 211                                 tag);
 212                 record = (struct bi_record *)((unsigned long)record + size);
 213         }
 214
 215         m68k_realnum_memory = m68k_num_memory;
 216 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 217         if (m68k_num_memory > 1) {
 218                 pr_warn("%s: ignoring last %i chunks of physical memory\n",
 219                         __func__, (m68k_num_memory - 1));
 220                 m68k_num_memory = 1;
 221         }
 222 #endif
 223 }
 224
 225 void __init setup_arch(char **cmdline_p)
 226 {
 227         /* The bootinfo is located right after the kernel */
 228         if (!CPU_IS_COLDFIRE)
 229                 m68k_parse_bootinfo((const struct bi_record *)_end);
 230
 231         if (CPU_IS_040)
 232                 m68k_is040or060 = 4;
 233         else if (CPU_IS_060)
 234                 m68k_is040or060 = 6;
 235
 236         /* FIXME: m68k_fputype is passed in by Penguin booter, which can
 237          * be confused by software FPU emulation. BEWARE.
 238          * We should really do our own FPU check at startup.
 239          * [what do we do with buggy 68LC040s? if we have problems
 240          *  with them, we should add a test to check_bugs() below] */
 241 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
 242         /* clear the fpu if we have one */
 243         if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
 244                 volatile int zero = 0;
 245                 asm volatile ("frestore %0" : : "m" (zero));
 246         }
 247 #endif
 248
 249         if (CPU_IS_060) {
 250                 u32 pcr;
 251
 252                 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
 253                      : "=d" (pcr));
 254                 if (((pcr >> 8) & 0xff) <= 5) {
 255                         pr_warn("Enabling workaround for errata I14\n");
 256                         asm (".chip 68060; movec %0,%%pcr; .chip 68k"
 257                              : : "d" (pcr | 0x20));
 258                 }
 259         }
 260
 261         init_mm.start_code = PAGE_OFFSET;
 262         init_mm.end_code = (unsigned long)_etext;
 263         init_mm.end_data = (unsigned long)_edata;
 264         init_mm.brk = (unsigned long)_end;
 265
 266 #if defined(CONFIG_BOOTPARAM)
 267         strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
 268         m68k_command_line[CL_SIZE - 1] = 0;
 269 #endif /* CONFIG_BOOTPARAM */
 270         process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
 271         *cmdline_p = m68k_command_line;
 272         memcpy(boot_command_line, *cmdline_p, CL_SIZE);
 273
 274         parse_early_param();
 275
 276         switch (m68k_machtype) {
 277 #ifdef CONFIG_AMIGA
 278         case MACH_AMIGA:
 279                 config_amiga();
 280                 break;
 281 #endif
 282 #ifdef CONFIG_ATARI
 283         case MACH_ATARI:
 284                 config_atari();
 285                 break;
 286 #endif
 287 #ifdef CONFIG_MAC
 288         case MACH_MAC:
 289                 config_mac();
 290                 break;
 291 #endif
 292 #ifdef CONFIG_SUN3
 293         case MACH_SUN3:
 294                 config_sun3();
 295                 break;
 296 #endif
 297 #ifdef CONFIG_APOLLO
 298         case MACH_APOLLO:
 299                 config_apollo();
 300                 break;
 301 #endif
 302 #ifdef CONFIG_MVME147
 303         case MACH_MVME147:
 304                 config_mvme147();
 305                 break;
 306 #endif
 307 #ifdef CONFIG_MVME16x
 308         case MACH_MVME16x:
 309                 config_mvme16x();
 310                 break;
 311 #endif
 312 #ifdef CONFIG_BVME6000
 313         case MACH_BVME6000:
 314                 config_bvme6000();
 315                 break;
 316 #endif
 317 #ifdef CONFIG_HP300
 318         case MACH_HP300:
 319                 config_hp300();
 320                 break;
 321 #endif
 322 #ifdef CONFIG_Q40
 323         case MACH_Q40:
 324                 config_q40();
 325                 break;
 326 #endif
 327 #ifdef CONFIG_SUN3X
 328         case MACH_SUN3X:
 329                 config_sun3x();
 330                 break;
 331 #endif
 332 #ifdef CONFIG_COLDFIRE
 333         case MACH_M54XX:
 334         case MACH_M5441X:
 335                 cf_bootmem_alloc();
 336                 cf_mmu_context_init();
 337                 config_BSP(NULL, 0);
 338                 break;
 339 #endif
 340         default:
 341                 panic("No configuration setup");
 342         }
 343
 344         paging_init();
 345
 346 #ifdef CONFIG_NATFEAT
 347         nf_init();
 348 #endif
 349
 350 #ifndef CONFIG_SUN3
 351 #ifdef CONFIG_BLK_DEV_INITRD
 352         if (m68k_ramdisk.size) {
 353                 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
 354                 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
 355                 initrd_end = initrd_start + m68k_ramdisk.size;
 356                 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
 357         }
 358 #endif
 359
 360 #ifdef CONFIG_ATARI
 361         if (MACH_IS_ATARI)
 362                 atari_stram_reserve_pages((void *)availmem);
 363 #endif
 364 #ifdef CONFIG_SUN3X
 365         if (MACH_IS_SUN3X) {
 366                 dvma_init();
 367         }
 368 #endif
 369
 370 #endif /* !CONFIG_SUN3 */
 371
 372 /* set ISA defs early as possible */
 373 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 374         if (MACH_IS_Q40) {
 375                 isa_type = ISA_TYPE_Q40;
 376                 isa_sex = 0;
 377         }
 378 #ifdef CONFIG_AMIGA_PCMCIA
 379         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
 380                 isa_type = ISA_TYPE_AG;
 381                 isa_sex = 1;
 382         }
 383 #endif
 384 #ifdef CONFIG_ATARI_ROM_ISA
 385         if (MACH_IS_ATARI) {
 386                 isa_type = ISA_TYPE_ENEC;
 387                 isa_sex = 0;
 388         }
 389 #endif
 390 #endif
 391 }
 392
 393 static int show_cpuinfo(struct seq_file *m, void *v)
 394 {
 395         const char *cpu, *mmu, *fpu;
 396         unsigned long clockfreq, clockfactor;
 397
 398 #define LOOP_CYCLES_68020       (8)
 399 #define LOOP_CYCLES_68030       (8)
 400 #define LOOP_CYCLES_68040       (3)
 401 #define LOOP_CYCLES_68060       (1)
 402 #define LOOP_CYCLES_COLDFIRE    (2)
 403
 404         if (CPU_IS_020) {
 405                 cpu = "68020";
 406                 clockfactor = LOOP_CYCLES_68020;
 407         } else if (CPU_IS_030) {
 408                 cpu = "68030";
 409                 clockfactor = LOOP_CYCLES_68030;
 410         } else if (CPU_IS_040) {
 411                 cpu = "68040";
 412                 clockfactor = LOOP_CYCLES_68040;
 413         } else if (CPU_IS_060) {
 414                 cpu = "68060";
 415                 clockfactor = LOOP_CYCLES_68060;
 416         } else if (CPU_IS_COLDFIRE) {
 417                 cpu = "ColdFire";
 418                 clockfactor = LOOP_CYCLES_COLDFIRE;
 419         } else {
 420                 cpu = "680x0";
 421                 clockfactor = 0;
 422         }
 423
 424 #ifdef CONFIG_M68KFPU_EMU_ONLY
 425         fpu = "none(soft float)";
 426 #else
 427         if (m68k_fputype & FPU_68881)
 428                 fpu = "68881";
 429         else if (m68k_fputype & FPU_68882)
 430                 fpu = "68882";
 431         else if (m68k_fputype & FPU_68040)
 432                 fpu = "68040";
 433         else if (m68k_fputype & FPU_68060)
 434                 fpu = "68060";
 435         else if (m68k_fputype & FPU_SUNFPA)
 436                 fpu = "Sun FPA";
 437         else if (m68k_fputype & FPU_COLDFIRE)
 438                 fpu = "ColdFire";
 439         else
 440                 fpu = "none";
 441 #endif
 442
 443         if (m68k_mmutype & MMU_68851)
 444                 mmu = "68851";
 445         else if (m68k_mmutype & MMU_68030)
 446                 mmu = "68030";
 447         else if (m68k_mmutype & MMU_68040)
 448                 mmu = "68040";
 449         else if (m68k_mmutype & MMU_68060)
 450                 mmu = "68060";
 451         else if (m68k_mmutype & MMU_SUN3)
 452                 mmu = "Sun-3";
 453         else if (m68k_mmutype & MMU_APOLLO)
 454                 mmu = "Apollo";
 455         else if (m68k_mmutype & MMU_COLDFIRE)
 456                 mmu = "ColdFire";
 457         else
 458                 mmu = "unknown";
 459
 460         clockfreq = loops_per_jiffy * HZ * clockfactor;
 461
 462         seq_printf(m, "CPU:\t\t%s\n"
 463                    "MMU:\t\t%s\n"
 464                    "FPU:\t\t%s\n"
 465                    "Clocking:\t%lu.%1luMHz\n"
 466                    "BogoMips:\t%lu.%02lu\n"
 467                    "Calibration:\t%lu loops\n",
 468                    cpu, mmu, fpu,
 469                    clockfreq/1000000,(clockfreq/100000)%10,
 470                    loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
 471                    loops_per_jiffy);
 472         return 0;
 473 }
 474
 475 static void *c_start(struct seq_file *m, loff_t *pos)
 476 {
 477         return *pos < 1 ? (void *)1 : NULL;
 478 }
 479 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 480 {
 481         ++*pos;
 482         return NULL;
 483 }
 484 static void c_stop(struct seq_file *m, void *v)
 485 {
 486 }
 487 const struct seq_operations cpuinfo_op = {
 488         .start  = c_start,
 489         .next   = c_next,
 490         .stop   = c_stop,
 491         .show   = show_cpuinfo,
 492 };
 493
 494 #ifdef CONFIG_PROC_HARDWARE
 495 static int hardware_proc_show(struct seq_file *m, void *v)
 496 {
 497         char model[80];
 498         unsigned long mem;
 499         int i;
 500
 501         if (mach_get_model)
 502                 mach_get_model(model);
 503         else
 504                 strcpy(model, "Unknown m68k");
 505
 506         seq_printf(m, "Model:\t\t%s\n", model);
 507         for (mem = 0, i = 0; i < m68k_num_memory; i++)
 508                 mem += m68k_memory[i].size;
 509         seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
 510
 511         if (mach_get_hardware_list)
 512                 mach_get_hardware_list(m);
 513
 514         return 0;
 515 }
 516
 517 static int __init proc_hardware_init(void)
 518 {
 519         proc_create_single("hardware", 0, NULL, hardware_proc_show);
 520         return 0;
 521 }
 522 module_init(proc_hardware_init);
 523 #endif
 524
 525 void check_bugs(void)
 526 {
 527 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
 528         if (m68k_fputype == 0) {
 529                 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
 530                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
 531                 pr_emerg("Upgrade your hardware or join the FPU "
 532                         "emulation project\n");
 533                 panic("no FPU");
 534         }
 535 #endif /* !CONFIG_M68KFPU_EMU */
 536 }
 537
 538 #ifdef CONFIG_ADB
 539 static int __init adb_probe_sync_enable (char *str) {
 540         extern int __adb_probe_sync;
 541         __adb_probe_sync = 1;
 542         return 1;
 543 }
 544
 545 __setup("adb_sync", adb_probe_sync_enable);
 546 #endif /* CONFIG_ADB */
 547
 548 #if IS_ENABLED(CONFIG_NVRAM)
 549 #ifdef CONFIG_MAC
 550 static unsigned char m68k_nvram_read_byte(int addr)
 551 {
 552         if (MACH_IS_MAC)
 553                 return mac_pram_read_byte(addr);
 554         return 0xff;
 555 }
 556
 557 static void m68k_nvram_write_byte(unsigned char val, int addr)
 558 {
 559         if (MACH_IS_MAC)
 560                 mac_pram_write_byte(val, addr);
 561 }
 562 #endif /* CONFIG_MAC */
 563
 564 #ifdef CONFIG_ATARI
 565 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
 566 {
 567         if (MACH_IS_ATARI)
 568                 return atari_nvram_read(buf, count, ppos);
 569         else if (MACH_IS_MAC)
 570                 return nvram_read_bytes(buf, count, ppos);
 571         return -EINVAL;
 572 }
 573
 574 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
 575 {
 576         if (MACH_IS_ATARI)
 577                 return atari_nvram_write(buf, count, ppos);
 578         else if (MACH_IS_MAC)
 579                 return nvram_write_bytes(buf, count, ppos);
 580         return -EINVAL;
 581 }
 582
 583 static long m68k_nvram_set_checksum(void)
 584 {
 585         if (MACH_IS_ATARI)
 586                 return atari_nvram_set_checksum();
 587         return -EINVAL;
 588 }
 589
 590 static long m68k_nvram_initialize(void)
 591 {
 592         if (MACH_IS_ATARI)
 593                 return atari_nvram_initialize();
 594         return -EINVAL;
 595 }
 596 #endif /* CONFIG_ATARI */
 597
 598 static ssize_t m68k_nvram_get_size(void)
 599 {
 600         if (MACH_IS_ATARI)
 601                 return atari_nvram_get_size();
 602         else if (MACH_IS_MAC)
 603                 return mac_pram_get_size();
 604         return -ENODEV;
 605 }
 606
 607 /* Atari device drivers call .read (to get checksum validation) whereas
 608  * Mac and PowerMac device drivers just use .read_byte.
 609  */
 610 const struct nvram_ops arch_nvram_ops = {
 611 #ifdef CONFIG_MAC
 612         .read_byte      = m68k_nvram_read_byte,
 613         .write_byte     = m68k_nvram_write_byte,
 614 #endif
 615 #ifdef CONFIG_ATARI
 616         .read           = m68k_nvram_read,
 617         .write          = m68k_nvram_write,
 618         .set_checksum   = m68k_nvram_set_checksum,
 619         .initialize     = m68k_nvram_initialize,
 620 #endif
 621         .get_size       = m68k_nvram_get_size,
 622 };
 623 EXPORT_SYMBOL(arch_nvram_ops);
 624 #endif /* CONFIG_NVRAM */